/Engine/Plugins/Runtime/MeshModelingToolset/Source/ModelingOperators/Public/ModelingTaskTypes.h
keep in mind that the target TTask may not terminate immediately (hence all the machinery). It may continue to use resources/CPU for some time.
template<typename TTask> class FAsyncTaskExecuterWithAbort : public [FAsyncTask< TTask >](API\Runtime\Core\Async\FAsyncTask)
bool
bAbort
Set to true to abort the child task.